Journal of Research of the National Bureau of Standards
AbstractThe thermodynamic pK value of picric acid was determined spectrophotometrically in water containing hydrochloric acid to repress the ionization. The pK value 0.33 (K � 0.46) was obtained from data at 450 m�. Attempts to determine the pK value by potentiometric titrations of picric acid and by spectrophotometric measurements of picric acid solutions in the near-saturation range did not yield satisfactory results. The new pK value is compared with previously published values.
CiteJ. Res. Nat. Bur. Stand. Sec. A: Phys. Ch., Vol. 67A, No. 3, p. 241
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